Interfacial control between perovskite and charge transporting materials for efficient and stable perovskite solar cells
Jangwon Seo a
a Division of Advanced Materials, Korea Research Institute of Chemical Technology (KRICT), 141 Gajeongro, Yuseong, Daejeon, 305, Korea, Republic of
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Roma, Italy, 2019 May 12th - 15th
Organizers: Prashant Kamat, Filippo De Angelis and Aldo Di Carlo
Pending, Jangwon Seo, presentation 131
Publication date: 11th February 2019

Current perovskite solar cells (PSCs) intended for commercialization in the near future require both high efficiency and good long-term stability. Most highly efficient PSCs utilize an n-type layer of mesoporous titanium dioxide in an n-i-p device configuration, in which organic conductors are widely used to transport holes into an adjoined metal. Thus far, a variety of efforts have been devoted to achieve a defect-less perovskite film with high-quality morphologies to realize reduced loss-in-potential outcomes and enhanced efficiency levels. In this work, we prepared a high quality of the perovskite film consisting of (FAPbI3)1-x(MAPbBr3)x with the help of the additive. The further interface engineering led to a better physical contact at the interface of the perovskite and the hole transporting material (HTM) for facilitating the charge extraction, and a well-matched energy level between the perovskite and the HTM for increasing the open-circuit voltage. Thus, we could achieve high power conversion efficiencies over 22%. In addition, the resultant devices exhibited long-term stability under exposure of humid and light condition. The importance of the interplay between the surface property of the perovskite and the HTM will be discussed in this talk.

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